Why Are States So Red and Blue?

Regardless of who wins the presidential election, we already know now how most of the electoral map will be colored, which will be close to the way it has been colored for decades. …

But why do ideology and geography cluster so predictably? Why, if you know a person’s position on gay marriage, can you predict that he or she will want to increase the military budget and decrease the tax rate, and is more likely to hail from Wyoming or Georgia than from Minnesota or Vermont? [cont.]

Steven Pinker, Harvard (NYT)

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